Portable transportation headrest



FIG. 1 is a front elevational view of a portable transportation headrest showing our new design;

FIG. 2 is a left side elevational view thereof, the right side being a mirror image of that shown;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a top, front, and right side perspective view thereof, showing the headrest in use on an automobile seat, the broken-line disclosure of a portion of the seatback being for illustrative purposes only and forming no part of the claimed design. 

The ornamental design for a portable transportation headrest, as shown and described. 